Method and apparatus for selecting cell to be camped on

Patent metadata

Field	Value
Publication number	US-11937173-B2
Application number	US-202016989164-A
Country	US
Kind code	B2
Filing date	Aug 10, 2020
Priority date	Feb 11, 2018
Publication date	Mar 19, 2024
Grant date	Mar 19, 2024

Abstract

A method includes selecting N cells waiting to be camped on from a candidate cell list, decoding a Physical Broadcast Channel (PBCH) of each of the selected N cells waiting to be camped on, selecting, from at least one cell whose PBCH is successfully decoded, one cell as a cell continuing waiting to be camped on, and when a remaining minimum system information (RMSI) decoding result of the cell continuing waiting to be camped on indicates that the cell continuing waiting to be camped on meets a camping criterion, determining the cell continuing waiting to be camped on as the cell to be camped on.

First claim

What is claimed is:

1. A method for selecting a cell to be camped on, the method comprising:
obtaining an initial cell list through initial receive beam sweeping;
obtaining a candidate cell list based on a barred cell list of a terminal and the initial cell list;
determining that a second cell of a first plurality of cells is in the candidate cell list by determining that the second cell is in the initial cell list and the barred cell list and does not meet a barring condition;
selecting the first plurality of cells waiting to be camped on from a second plurality of cells in the candidate cell list;
attempting to decode a physical broadcast channel (PBCH) of all cells sequentially of the first plurality of cells;
after attempting to decode the PBCH of all cells sequentially of the first plurality of cells, obtaining the second cell whose PBCH is successfully decoded;
selecting the second cell to be remaining minimum system information (RMSI) decoded;
decoding RMSI of the second cell to obtain an RMSI decoding result; and
selecting the second cell as a cell to be camped on in response to the RMSI decoding result indicating that the second cell meets a camping criterion.

2. The method of claim 1 , wherein before selecting the first plurality of cells, the method further comprises
selecting the first plurality of cells from the second plurality of cells in the candidate cell list based on a signal strength metric of each of the second plurality of cells.

3. The method of claim 2 , wherein the barred cell list comprises at least one of:
a cell that is barred from being camped on based on a historical PBCH decoding result; or
a cell that is not barred from being camped on based on the historical PBCH decoding result and that comprises a previous RMSI that fails to be decoded.

4. The method of claim 2 , further comprising:
calculating the signal strength metric of each of the second plurality of cells; and
selecting, from the second plurality of cells, cells with signal strength metrics within a top ranking as the first plurality of cells.

5. The method of claim 2 , wherein the signal strength metric comprises at least one of a reference signal received power (RSRP), a reference signal received quality (RSRQ), or a signal-to-interference-plus-noise ratio (SINR).

6. The method of claim 1 , wherein before selecting the first plurality of cells, the method further comprises:
selecting, from the second plurality of cells, a fourth plurality of cells pre-waiting to be camped on based on a signal strength metric of a cell, wherein a quantity of the fourth plurality of cells is greater than or equal to a quantity of the first plurality of cells; and
selecting the first plurality of cells from the fourth plurality of cells based on the barred cell list of the terminal.

7. The method of claim 1 , further comprising
selecting, from a third plurality of cells whose PBCH is successfully decoded, a cell with a largest signal strength metric as the second cell.

8. The method of claim 1 , further comprising:
determining the second cell does not meet the barring condition based on a current condition of the second cell satisfying the barring condition; and
adding the second cell to the candidate cell list.

9. The method of claim 8 , wherein the barring condition is a preset threshold.

10. An apparatus for selecting a cell to be camped on, the apparatus comprising:
a processor; and
a memory coupled to the processor and configured to store instructions that, when executed by the processor, cause the apparatus to be configured to:
obtain an initial cell list through initial receive beam sweeping;
obtain a candidate cell list based on a barred cell list of a terminal and the initial cell list;
determine that a second cell of a first plurality of cells is in the candidate cell list by determining that the second cell is in the initial cell list and the barred cell list and does not meet a barring condition;
select the first plurality of cells waiting to be camped on from a second plurality of cells in the candidate cell list;
attempt to decode a physical broadcast channel (PBCH) of all cells sequentially of the first plurality of cells;
after attempting to decode the PBCH of all cells sequentially of the first plurality of cells, obtain the second cell whose PBCH is successfully decoded;
select the second cell to be remaining minimum system information (RMSI) decoded;
decode RMSI of the second cell to obtain an RMSI decoding result; and
select the second cell as a cell to be camped on when the RMSI decoding result indicates that the second cell meets a camping criterion.

11. The apparatus of claim 10 , wherein the instructions further cause the processor to select the first plurality of cells from the second plurality of cells in the candidate cell list based on a signal strength metric of each of the second plurality of cells.

12. The apparatus of claim 11 , wherein the barred cell list comprises at least one of:
a cell that is barred from being camped on based on a historical PBCH decoding result; or
a cell that is not barred from being camped on based on the historical PBCH decoding result and that comprises a previous RMSI that fails to be decoded.

13. The apparatus of claim 11 , wherein the instructions further cause the processor to:
calculate the signal strength metric of each of the second plurality of cells in the candidate cell list; and
select, from the second plurality of cells in the candidate cell list, cells with signal strength metrics within a top ranking as the first plurality of cells.

14. The apparatus of claim 11 , wherein the signal strength metric comprises at least one of reference signal received power (RSRP), reference signal received quality (RSRQ), or a signal-to-interference-plus-noise ratio (SINR).

15. The apparatus of claim 10 , wherein the instructions further cause the processor to:
select, from the second plurality of cells in the candidate cell list, a fourth plurality of cells pre-waiting to be camped on based on a signal strength metric of a cell, wherein a quantity of the fourth plurality of cells is greater than or equal to a quantity of the first plurality of cells; and
select the first plurality of cells from the fourth plurality of cells based on the barred cell list of the apparatus.

16. The apparatus of claim 10 , wherein the instructions further cause the processor to
select, from a third plurality of cells whose PBCH is successfully decoded, a cell with a largest signal strength metric as the second cell.

17. The apparatus of claim 10 , wherein the instructions further cause the processor to:
determine the second cell does not meet the barring condition based on a current condition of the second cell satisfying the barring condition; and
add the second cell to the candidate cell list.

18. A computer program product comprising computer-executable instructions that are stored on a non-transitory computer-readable medium and that, when executed by a processor, cause an apparatus to:
obtain an initial cell list through initial receive beam sweeping;
obtain a candidate cell list based on a barred cell list of a terminal and the initial cell list;
determine that a second cell of a first plurality of cells is in the candidate cell list by determining that the second cell is in the initial cell list and the barred cell list and does not meet a barring condition;
select the first plurality of cells waiting to be camped on from a second plurality of cells in the candidate cell lis

Assignees

• Huawei Tech Co Ltd

Inventors

• Wei Jingxin
• Han Lei
• Feng Kun

Classifications

• H04W48/16 Primary

  Discovering, processing access restriction or access information · CPC title

• H04W48/10 Primary

  using broadcasted information · CPC title

• H04W48/20

  Selecting an access point · CPC title

• H04W48/12 Primary

  using downlink control channel · CPC title

• H04W24/08

  Testing, {supervising or monitoring} using real traffic · CPC title